\(m_{SO_4}=m_{muối.sunfat}-m_{kim.loai}=79,44-19,92=59,52\left(g\right)\)
=> \(n_{SO_4}=\dfrac{59,52}{96}=0,62\left(mol\right)\)
=> \(n_{H_2SO_4\left(pư\right)}=0,62\left(mol\right)\)
\(n_{O_2\left(pư\right)}=\dfrac{25,04-19,92}{32}=0,16\left(mol\right)\)
Bảo toàn O: \(n_{H_2O}=0,32\left(mol\right)\)
Bảo toàn H: \(n_{H_2}=\dfrac{0,62.2-0,32.2}{2}=0,3\left(mol\right)\)
=> V = 0,3.22,4 = 6,72 (l)